<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script src="https://cdn.jsdelivr.net/npm/vue@2.6.12"></script>
</head>
<body>
<div id="app">
    <todo>
        <todo-title slot="todo-title" :title="title"></todo-title>
        <todo-items slot="todo-items" v-for="(item,index) in items" :item="item" :index="index"
                    @remove="removeItems(index)"></todo-items>
    </todo>
</div>
<script>
    //定义一个VUE组件
    //插槽--slot
    Vue.component("todo", {
        template: '<div>\
                         <slot name="todo-title"></slot>\
                         <ul>\
                             <slot name="todo-items"></slot>\
                          </ul>\
                          </div>'
    });
    Vue.component("todo-title", {
        props: ["title"],
        template: '<div>{{title}}</div>'
    });
    Vue.component("todo-items", {
        props: ['item', 'index'],
        template: '<li>{{index}}==>{{item}}<button @click="remove">删除</button></li>',
        methods: {
            remove: function (index) {
                //this.$emit自定义事件分发
                this.$emit('remove', index)
                //alert("hhh")
            }
        }
    });
    var app = new Vue({
        el: '#app',
        data: {
            title: "vue-study",
            items: ["java", "linux", "python"]
        },
        methods: {
            removeItems: function (index) {
                console.log('删除了第' + index + '个')
                this.items.splice(index, 1);//一次删除一个元素
            }
        }
    });
</script>
</body>
</html>